From d11881c1ad0d6a102962d1a040a398f597256ae0 Mon Sep 17 00:00:00 2001
From: Daniel Golle <daniel@makrotopia.org>
Date: Wed, 18 Apr 2018 19:24:31 +0200
Subject: [PATCH] mesh: make forwarding configurable
To: hostap@lists.infradead.org
Cc: Jouni Malinen <j@w1.fi>,
    Johannes Berg <johannes.berg@intel.com>

Allow mesh_fwding to be specified in a mesh bss config, pass that
to the driver (only nl80211 implemented for now) and announce
forwarding capability accordingly.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
 src/ap/ap_config.h                 | 2 ++
 src/drivers/driver.h               | 2 ++
 src/drivers/driver_nl80211.c       | 3 +++
 wpa_supplicant/config.c            | 4 ++++
 wpa_supplicant/config.h            | 3 +++
 wpa_supplicant/config_file.c       | 4 ++++
 wpa_supplicant/config_ssid.h       | 5 +++++
 wpa_supplicant/mesh.c              | 6 ++++++
 wpa_supplicant/mesh_mpm.c          | 4 ++--
 wpa_supplicant/wpa_supplicant.conf | 6 ++++++
 10 files changed, 37 insertions(+), 2 deletions(-)

--- a/src/ap/ap_config.h
+++ b/src/ap/ap_config.h
@@ -49,6 +49,7 @@ struct mesh_conf {
 	int dot11MeshRetryTimeout; /* msec */
 	int dot11MeshConfirmTimeout; /* msec */
 	int dot11MeshHoldingTimeout; /* msec */
+	int mesh_fwding;
 };
 
 #define MAX_STA_COUNT 2007
@@ -612,6 +613,7 @@ struct hostapd_bss_config {
 
 #define MESH_ENABLED BIT(0)
 	int mesh;
+	int mesh_fwding;
 
 	u8 radio_measurements[RRM_CAPABILITIES_IE_LEN];
 
--- a/src/drivers/driver.h
+++ b/src/drivers/driver.h
@@ -1363,6 +1363,7 @@ struct wpa_driver_mesh_bss_params {
 #define WPA_DRIVER_MESH_CONF_FLAG_MAX_PEER_LINKS	0x00000004
 #define WPA_DRIVER_MESH_CONF_FLAG_HT_OP_MODE		0x00000008
 #define WPA_DRIVER_MESH_CONF_FLAG_RSSI_THRESHOLD	0x00000010
+#define WPA_DRIVER_MESH_CONF_FLAG_FORWARDING		0x00000020
 	/*
 	 * TODO: Other mesh configuration parameters would go here.
 	 * See NL80211_MESHCONF_* for all the mesh config parameters.
@@ -1372,6 +1373,7 @@ struct wpa_driver_mesh_bss_params {
 	int peer_link_timeout;
 	int max_peer_links;
 	int rssi_threshold;
+	int forwarding;
 	u16 ht_opmode;
 };
 
--- a/src/drivers/driver_nl80211.c
+++ b/src/drivers/driver_nl80211.c
@@ -9197,6 +9197,9 @@ static int nl80211_put_mesh_config(struc
 	if (((params->flags & WPA_DRIVER_MESH_CONF_FLAG_AUTO_PLINKS) &&
 	     nla_put_u8(msg, NL80211_MESHCONF_AUTO_OPEN_PLINKS,
 			params->auto_plinks)) ||
+	    ((params->flags & WPA_DRIVER_MESH_CONF_FLAG_FORWARDING) &&
+	     nla_put_u8(msg, NL80211_MESHCONF_FORWARDING,
+			params->forwarding)) ||
 	    ((params->flags & WPA_DRIVER_MESH_CONF_FLAG_MAX_PEER_LINKS) &&
 	     nla_put_u16(msg, NL80211_MESHCONF_MAX_PEER_LINKS,
 			 params->max_peer_links)) ||
--- a/wpa_supplicant/config.c
+++ b/wpa_supplicant/config.c
@@ -2211,6 +2211,7 @@ static const struct parse_data ssid_fiel
 #ifdef CONFIG_MESH
 	{ INT_RANGE(mode, 0, 5) },
 	{ INT_RANGE(no_auto_peer, 0, 1) },
+	{ INT_RANGE(mesh_fwding, 0, 1) },
 	{ INT_RANGE(mesh_rssi_threshold, -255, 1) },
 #else /* CONFIG_MESH */
 	{ INT_RANGE(mode, 0, 4) },
@@ -2757,6 +2758,7 @@ void wpa_config_set_network_defaults(str
 	ssid->dot11MeshRetryTimeout = DEFAULT_MESH_RETRY_TIMEOUT;
 	ssid->dot11MeshConfirmTimeout = DEFAULT_MESH_CONFIRM_TIMEOUT;
 	ssid->dot11MeshHoldingTimeout = DEFAULT_MESH_HOLDING_TIMEOUT;
+	ssid->mesh_fwding = DEFAULT_MESH_FWDING;
 	ssid->mesh_rssi_threshold = DEFAULT_MESH_RSSI_THRESHOLD;
 #endif /* CONFIG_MESH */
 #ifdef CONFIG_HT_OVERRIDES
@@ -3886,6 +3888,7 @@ struct wpa_config * wpa_config_alloc_emp
 	config->user_mpm = DEFAULT_USER_MPM;
 	config->max_peer_links = DEFAULT_MAX_PEER_LINKS;
 	config->mesh_max_inactivity = DEFAULT_MESH_MAX_INACTIVITY;
+	config->mesh_fwding = DEFAULT_MESH_FWDING;
 	config->dot11RSNASAERetransPeriod =
 		DEFAULT_DOT11_RSNA_SAE_RETRANS_PERIOD;
 	config->fast_reauth = DEFAULT_FAST_REAUTH;
@@ -4508,6 +4511,7 @@ static const struct global_parse_data gl
 	{ INT(user_mpm), 0 },
 	{ INT_RANGE(max_peer_links, 0, 255), 0 },
 	{ INT(mesh_max_inactivity), 0 },
+	{ INT_RANGE(mesh_fwding, 0, 1), 0 },
 	{ INT(dot11RSNASAERetransPeriod), 0 },
 #endif /* CONFIG_MESH */
 	{ INT(disable_scan_offload), 0 },
--- a/wpa_supplicant/config.h
+++ b/wpa_supplicant/config.h
@@ -18,6 +18,7 @@
 #define DEFAULT_USER_MPM 1
 #define DEFAULT_MAX_PEER_LINKS 99
 #define DEFAULT_MESH_MAX_INACTIVITY 300
+#define DEFAULT_MESH_FWDING 1
 /*
  * The default dot11RSNASAERetransPeriod is defined as 40 ms in the standard,
  * but use 1000 ms in practice to avoid issues on low power CPUs.
@@ -1269,6 +1270,8 @@ struct wpa_config {
 	 */
 	int mesh_max_inactivity;
 
+	int mesh_fwding;
+
 	/**
 	 * dot11RSNASAERetransPeriod - Timeout to retransmit SAE Auth frame
 	 *
--- a/wpa_supplicant/config_file.c
+++ b/wpa_supplicant/config_file.c
@@ -816,6 +816,7 @@ static void wpa_config_write_network(FIL
 #endif /* IEEE8021X_EAPOL */
 	INT(mode);
 	INT(no_auto_peer);
+	INT(mesh_fwding);
 	INT(frequency);
 	INT(fixed_freq);
 #ifdef CONFIG_ACS
@@ -1433,6 +1434,9 @@ static void wpa_config_write_global(FILE
 		fprintf(f, "mesh_max_inactivity=%d\n",
 			config->mesh_max_inactivity);
 
+	if (config->mesh_fwding != DEFAULT_MESH_FWDING)
+		fprintf(f, "mesh_fwding=%d\n", config->mesh_fwding);
+
 	if (config->dot11RSNASAERetransPeriod !=
 	    DEFAULT_DOT11_RSNA_SAE_RETRANS_PERIOD)
 		fprintf(f, "dot11RSNASAERetransPeriod=%d\n",
--- a/wpa_supplicant/config_ssid.h
+++ b/wpa_supplicant/config_ssid.h
@@ -492,6 +492,11 @@ struct wpa_ssid {
 	int dot11MeshConfirmTimeout; /* msec */
 	int dot11MeshHoldingTimeout; /* msec */
 
+	/**
+	 * Mesh network layer-2 forwarding
+	 */
+	int mesh_fwding;
+
 	int ht;
 	int ht40;
 
--- a/wpa_supplicant/mesh.c
+++ b/wpa_supplicant/mesh.c
@@ -121,6 +121,7 @@ static struct mesh_conf * mesh_config_cr
 	conf->mesh_cc_id = 0;
 	conf->mesh_sp_id = MESH_SYNC_METHOD_NEIGHBOR_OFFSET;
 	conf->mesh_auth_id = (conf->security & MESH_CONF_SEC_AUTH) ? 1 : 0;
+	conf->mesh_fwding = ssid->mesh_fwding;
 	conf->dot11MeshMaxRetries = ssid->dot11MeshMaxRetries;
 	conf->dot11MeshRetryTimeout = ssid->dot11MeshRetryTimeout;
 	conf->dot11MeshConfirmTimeout = ssid->dot11MeshConfirmTimeout;
@@ -256,6 +257,7 @@ static int wpa_supplicant_mesh_init(stru
 	bss->conf->start_disabled = 1;
 	bss->conf->mesh = MESH_ENABLED;
 	bss->conf->ap_max_inactivity = wpa_s->conf->mesh_max_inactivity;
+	bss->conf->mesh_fwding = wpa_s->conf->mesh_fwding;
 
 	if (ieee80211_is_dfs(ssid->frequency) && wpa_s->conf->country[0]) {
 		conf->ieee80211h = 1;
@@ -508,6 +510,10 @@ int wpa_supplicant_join_mesh(struct wpa_
 	}
 	params->conf.peer_link_timeout = wpa_s->conf->mesh_max_inactivity;
 
+	/* always explicitely set forwarding to on or off for now */
+	params->conf.flags |= WPA_DRIVER_MESH_CONF_FLAG_FORWARDING;
+	params->conf.forwarding = ssid->mesh_fwding;
+
 	wpa_s->mesh_params = params;
 	if (wpa_supplicant_mesh_init(wpa_s, ssid, &params->freq)) {
 		wpa_msg(wpa_s, MSG_ERROR, "Failed to init mesh");
--- a/wpa_supplicant/mesh_mpm.c
+++ b/wpa_supplicant/mesh_mpm.c
@@ -288,9 +288,9 @@ static void mesh_mpm_send_plink_action(s
 		info = (bss->num_plinks > 63 ? 63 : bss->num_plinks) << 1;
 		/* TODO: Add Connected to Mesh Gate/AS subfields */
 		wpabuf_put_u8(buf, info);
-		/* always forwarding & accepting plinks for now */
+		/* set forwarding & always accepting plinks for now */
 		wpabuf_put_u8(buf, MESH_CAP_ACCEPT_ADDITIONAL_PEER |
-			      MESH_CAP_FORWARDING);
+			      (conf->mesh_fwding ? MESH_CAP_FORWARDING : 0));
 	} else {	/* Peer closing frame */
 		/* IE: Mesh ID */
 		wpabuf_put_u8(buf, WLAN_EID_MESH_ID);
--- a/wpa_supplicant/wpa_supplicant.conf
+++ b/wpa_supplicant/wpa_supplicant.conf
@@ -153,6 +153,12 @@ ap_scan=1
 # This timeout value is used in mesh STA to clean up inactive stations.
 #mesh_max_inactivity=300
 
+# Enable 802.11s layer-2 routing and forwarding
+#mesh_fwding=1
+
+# Accept additional peer links
+#mesh_auto_open_plinks=1
+
 # cert_in_cb - Whether to include a peer certificate dump in events
 # This controls whether peer certificates for authentication server and
 # its certificate chain are included in EAP peer certificate events. This is
